Table 3

Pearson’s correlation coefficients between WPAI-SHP summary scores and PRO at baseline.

PRO Measure	Absenteeism	Presenteeism	Activity Impairment	Work Productivity Loss
SF-36 Physical Functioning	−0.42†	−0.64*	−0.64*	−0.60*
SF-36 Role-Physical	−0.42†	−0.48*	−0.53*	−0.51*
SF-36 Bodily Pain	−0.35†	−0.62*	−0.56*	−0.57*
SF-36 General Health	−0.24	−0.41*	−0.33*	−0.36*
SF-36 Vitality	−0.27*	−0.30†	−0.32*	−0.31*
SF-36 Social Functioning	−0.37*	−0.40*	−0.47*	−0.40*
SF-36 Role-emotional	−0.28*	−0.34†	−0.26†	−0.36*
SF-36 Mental Health	−0.24*	−0.29†	−0.28*	−0.28†
SF-36 PCS	−0.34†	−0.67†	−0.64*	−0.63*
SF-36 MCS	−0.27†	−0.28†	−0.26†	−0.30†
ASQOL	0.44*	0.60*	0.61*	0.57*
BASDAI	0.19	0.47*	0.59*	0.46*
BASFI	0.34†	0.56*	0.60*	0.50*
BASMI	0.26*	0.32†	0.35*	0.32†
HUI-3 Overall	−0.36*	−0.45*	−0.53*	−0.50*
Total back pain	0.25	0.48*	0.36*	0.43*
Nocturnal pain	0.15	0.38†	0.38*	0.30†
Patient’s global assessment of disease activity	0.15	0.53*	0.54*	0.44*
Physician’s global assessment of disease activity	0.02	0.34*	0.37*	0.28†

Data adjusted for age, sex, baseline comorbidities, and baseline disease activity (BASDAI). Interpretation of correlation coefficients: < 0.5, weak; 0.5–0.69, moderate; 0.7–1.0, strong or very strong.
↵*p < 0.00l;
↵† p < 0.005. WPAI-SHP: Work Productivity and Activity Impairment-Specific Health Problem Questionnaire; PRO: patient-reported outcome; SF-36: Short Form 36 Health Survey; PCS: Physical Component Summary; MCS: Mental Component Summary; ASQOL: AS Quality of Life Questionnaire; BASFI: Bath AS Functional Index; BASMI: Bath AS Metrology Index; HUI-3: Health Utilities Index Mark 3.